James ball



(No Model.)

- J. BALL. INUANDBSGBNT LAMP.

Patented May 81,1892.

@Mx/MM" il'NrTED STATES A'rnrrr einen.

JAMES BALL, OF I-IOLYOKE, MASSACHUSETTS, ASSIGNOR OF T\VOTHIRDS TO JAMEST. ABBE AND GEORGE N. TYNER, OF SAME PLACE.

INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 476,183, dated May 31,1892.

Application filed November 23, 1891. Serial No. 412,748. (No model.)

To @ZZ whom it may concern:

Be it known that I, JAMES BALL, a citizen ot' the United States,residing at Holyoke, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements in IncandescentElectric Lamps, ot which the following is a specilication.

This invention relates to improvements in that class of the incandescentlamp wherein ro are embodied two or more filaments, each ot' which hasconnected thereto electric conductors, which are extended outside of thevacuum-chamber, so that either of the iilaments is available to beplaced subject to the r 5 electric circuit, as circumstances may renderadvantageous.

The invention consists in improved coustructions and the combination orarrangement of the parts, all substantially as will zo hereinafter morefully appear, and be set forth in the claims. y

In the accompanying drawings the present invention is illustrated,Figure l being a per spective view of a common form of incandescentelectric lamphaving the present improvements applied thereto. Fig. 2 isa longitudinal section through the parts of the lamp which moreparticularly pertain to the invention. Fig. 3 is a perspective View indetail of 3o one of the binding-posts employed. Fig. 4 is across-sectional viewof the lamp on line 5 5, Fig. l.

In the above drawings it has not been deemed advisable to show thesocket for the lamp, although the switch is shown in Fig. 1, and in saidFig. l a section a of a screw-ring is shown, which constitutes a part ofthe socket. Also, in the drawings, tor the purpose of perspicuity andavoidance of confusion, one of the filaments is indicated, as by a heavyblack line, and the other y by double light lines.

In the drawings and as usual, b represents the thin metallic screw-ring,which is adapted to screw-engage the socket, of which the said section(indicated at a) is a part.

d represents one of the leading-in wires or filament-conductorextensions, which has its outer end connected to or in contact with the5o screw-ring and extending thence through the insulating plaste1ofparisf within the ring and through the inverted glass dome g, which forms theupper part of the globe, has its extremity disposed within thevacuum-space of the globe, and at l0 receives in connection 55 therewiththe end ofthe filament as. Said filament thence extends in the usualbowed course and has its other end attached to the other leading-in wire7L therefor, which, extending throughthe said glass dome and insulating6a material and without contact with the screwring, terminates incontact with the bindingpost i, which is stewn as embedded in theplaster-of-paris at the upper end of the lampshank, the binding-postbeing deemed preferable to the usual flat plate or shallow cup commonlyused in a corresponding position in the Edison lamp.

j and 7c are the wires for bringing the cur-- rent to the lamp andleading it from the lamp 7o back to the line, the said wire j in Fig. lbeing shown as connected to a bindingpost on a part of the switch whichis in electrical communication with the ring b, and. hence with theleading-in wire CZ. The other wire k is connected to the spring inger Z,which forms another part of the switch, and the said finger may or maynot bear upon the screw of the binding-post, accordingly as theswitchbutton m is or is not properly turned there- 8o for.

There is another binding-postte embedded in the insulating-tillingf inthe shankof the lamp, from which another leading-iu wire 2O passesthrough the glass dome into the 85 vacuum-chamber and receives the oneend ot the second filament y, the other end of which filament has anelectrical communication with the screw-ring, and thence with the Wirej. This communication with the screw-ring is, 9o as specifically shown,by way ot the branch l2 of the leading-in wire CZ and through said Wirecl, the said wire performing the double duty of acting as a leading-inwire, to which one end ot' each of two filaments may be con- 95 nected.Now it will be seen that there is for each end of each filament aleading-in wire which is extended to an available point to be placed inelectrical communication with the different wires j audk, which areincluded in Ico the circuit for the lamp. Vhile, as seen, a leading-inWire may be in connection with the one end, respectively, of severalfilaments, the leading-in Wires to which the other ends of thesefilaments are respectively connected must be-insulated from vthe firstleading-in Wire; and now With reference to the drawings, Figs. l and 2,it will be seen that the filament y is in the circuit for the current,which may come into the lamp through the Wirej, passing through thesocket and screwring to the leading-in Wire CZ and through the filamenty, thence by Way of the Wire 20 to the binding-post n, and through theswitchfinger to the Wire k. The end a of the buttonspindle isconstituted by an insulating material in order to prevent the lamp frombeing short-circuited. Now in case the filament y shcnld be severed ordestroyed the filament w may be brought into the circuit, and this maybe done by merely changing the screw for the binding-post u from itsposition on said binding-post to a position on the other binding-postt'. The current then coming in over wire j and through the leading-inwire d will avoid the branch l2, but pass through the filament Qc andthen through the Wire 7L and the switch-finger to the wire k, or ofcourse the current may be reversed, first coming in through 7c and l1and passing` out through d and j.

Having thus described my invention, what space of the lamp, tWo or moreseparate me tallic socketed pieces set in the said insulating material,several filaments, each having its one end connected to suitableportions of said leading-in Wired, and leading-in Wires which arerespectively connected to the other ends of the filaments and lead,respectively, to said socketed pieces, a screw-plug adapted to be set ineither of said socketed pieces, and a switch having the movable fingerl, adapted to range across all of' said socketed pieces and adapted tohave connection With the one thereof in which the screw-plug may be set,as set forth.

2. In an electric incandescent lamp, the combination, with the globe orbulb having a suitable insulating material at its shank, of aleading-inWire d, having a connection with a suitable metallic part Which isprovided therefor at the shank and extended into the vacuumspace of thelamp, two or more separate metallic pieces set in the said insulatingmaterial, several filaments, each having its one end connected tosuitable portions of said leading-in Wire d, and leading-in Wires whichare respectively connected to the other ends of the filaments and lead,respectively, to said metallic pieces, a movable contact piece adaptedto be supported vby either of said metallic pieces, and a switch havingthe movable'finger Z, adapted to range across all of said metallicpieces and adapted to have connection with the one thereof on which themovable contact-piece may be set,substan tially as set forth.

JAMES BALL.

Witnesses:

H. A. CHAPIN, WM, S. BELLoWs.

